Apparatus for the manufacture of lamp-black



(No Model.)

G. L. GABOT. APPARATUS FOR THE MANUFACTURE OPLAMP BLAcK.

No. 468,510. Patented Feb. 9, 1892.

W/ T/VE 55/55 i A 4 WWW UNITE STATES PATENT OFFICE.

GODFREY L. CABOT, OF CAMBRIDGE, MASSACHUSETTS.

APPARATUS FOR THE MANUFACTURE OF LAMP-BLACK.

SPECIFICATION forming part of Letters Patent No. 468,510, dated February 9, 189.2.

Application filed June 17, 1891. Serial No. 396,535. (No model.)

To aZZ whom it may concern.-

Be it known that I, GODFREY L. GABOT, a citizen of the United States, and a resident of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Apparatus for the Manufacture of Lamp-Black, of which the following is a specification.

My invention relates to the manufacture of lamp-black, and is especiallyadapted for use in lamp-black apparatus consisting, essentially, of a flat stationary collecting plate or ring, the under side of which is traversed by a large number of flames from a lamp revolving about a central standard or axis. IIitherto there has been much difficulty experienced in removing the accumulating black systematically from the plate when the coating has acquired the desirable thickness, and my invention is especially designed to facilitate such removal in a thorough, safe, and economical way while the deposition is still in progress.

In the drawings, which are part, of this specification, Figure 1 shows about half the collecting-plate in section and the revolving lamp and collecting-trough in side elevation. Fig. 2 is a plan view of part of the lamp and collecting-trough, the plate being removed. Fig. 3 is a longitudinal section of the trough and an elevation of the con veyer therein. Fig.4 is a cross-section of the trough and conveyer and part of the collecting-plate.

In the drawings, 10 represents the upright about which the lamp revolves. This lamp consists in the form shown of a number of tubes suitably supported by struts and tierods (not shown in Fig. 2) marked 12 and 14, respectively. The horizontal tubes 16 carry burners, the position of which is indicated by 18 in Fig. 2. The upright 10 is hollow, and gas is supplied thereto through the tube 20, which is sunk in the ground. From the standard the gas enters the gas-box 22,which encircles openings in the former and which is made to fit closely above and below by suitable stuliing-boxes. The collecting-plate is marked 24. It is sustained from the cap on the standard 10 by the rods 26, while it is kept from turning by one or more tangential stays (not shown) from its outer edge to any convenient abutment fast to the ground. The

center edge of this annular plate rests, furthermore, on the open spider 28, through which the upright current of heated air, which is produced by a large number of flames, can

rise unimpeded. The tube 30 connects the gas-box with the burner-tubes and the endless chain 32 passes over the angle-iron on the edge of the lamp-frame to a suitable driving-pulley, which, with its shaft, conveys the necessary power from a motor and causes the lamp to slowly revolve in the manner already referred to.

I collect the black from the under side of the depositing-plate first in the trough 34, which is a part of the lamp-frame and travels round the circle with it. The upper side of this trough is open and its edges approach the plate very closely, but do not touch it. Within the trough a longitudinal bar is supported, which carries the scrapers 36. These lie against the plate with an elastic pressure in a manner well understood. As the black falls from the scrapers into the bottom of the trough 34 it is taken charge of by the conveyer placed therein (marked 38) and made to travel slowly toward the center of the apparatus. For the sake of clearness the conveyer is not shown in Fig. 2, except in the middle, where the scrapers and bar are removed to show the conveyer underneath.

tionary bevel-wheel 42 on the upright 10. The" ends of the trough 34 are closed, and near the inner end is a drop-pipe 44. As the black is propelled toward the central axis of the apparatus it reaches the opening into this pipe and falls throughit to the circular distributing-trough 46 below. This trough is provided with an annular cover 48, through which the drop-pipe 44 passes freely, so that the circular trough is at all times closed, its cover being slowly rotated with said pipe by attach ments to the revolving lamp-frame. Under one part of this trough, in a tangential position, a spiral conveyor 50 (which may be driven by an outside mechanism) receives the black again and carries it from the distributing-trough to a convenient distance for packing, (50. It will be readily understood that,

although the black falls 011 every part of the floor of the circular trough, it is nevertheless all swept around by the lower end of the pendent pipe 44, so that it ultimately reaches the depression over the conveyer and is by it removed.

The advantages which are secured by this way of collecting are very marked, for the black from the time it is scraped from the plate 24 is forced positively forward to its destination, except while it falls directly downward through the drop-pipe 44, a fall that cannot be interfered with by any up current of air, inasmuch as the lowerend of said pipe is close to the bottom of the circular trough and embedded in a stratum of black. My manner of collecting protects the product also from the danger of fire, which is always incurred in lamp-black apparatus of this kind, because of the very great heat and large number of flames in close proximity to the deposit. This protection is due to the constant turning over of the accumulated black in the radial as well as in the circular and tangential troughs, whereby ignited particles are instantly covered and extinguished for want of air and by theircontact With the iron.

In'the consideration of my invention I do not wish to be understood that the precise details of construction set forth in this specification are indispensat as it is clear that other means could be used without deviating from the principle involved,-so as to carry the black'first from where it is disengaged by the scrapers inward to a distributing-receptacle and then to its destination for packing. For instance, the shaft of the conveyer 38 might be driven by a bevel-wheel at its outer end meshing into a'stationary circular rack suitably supported'on brackets or otherwise,whicl1 would evidently take the place of the stationary wheel 42, or the conveyer 50, which has been referred to and shown as tangential, might, if necessary, be radial and remove the black in that direction. Nor is it absolutely essential that spiral conveyers should be used, as other well-known forms could clearly be made efficient, though I have found and believe that devices of the kind shown and described are the best and most convenient for the ends in view.

hat I claim is 1. In a lamp-black apparatus provided with a rotating lamp and fixed collecting-plate, the combination of a radial trough traveling under the plate and surrounding the scrapers that remove the accumulation of black therefrom with said scrapers, a conveyer lying in said trough adapted to carry the black inward, a drop-pipe communicating with a covered annular trough below the lamp and carried thereby, a conveyer adapted to carry the black outward from said trough and away from the machine, and with means for driving the lamp and both conveyers, substantially described.

2. In the lamp-black apparatus herein described, the scraper 36 and the conveyer 38, driven by the gears 40 and 42, the drop-pipe 44, traveling with the lamp and passing through the annular cover 48, driven by the lamp, the circular trough 46,and the conveyer 50,'substantially as described.

'3. In a lam p-black apparatus provided with a collecting-plate and traveling sorapers'for removing the black therefrom, a trough for receiving the product so removed placed directly under said scrapers and provided with a conveyer lying therein, in combination with a central distributing-trough and with a tube connecting the two troughs extending from the bottom of thefirst to near the bottom of the last, whereby the discharging end of the connecting-tube becomes immersed and closed by the black and an updraft of air through the same is prevented, substantially as described.

.In witness whereof I have hereunto affixed my signature in the presence of two witnesses.

GODFREY L. CABOT. 

